Whirlpool ACM052MM Service Manual page 42

PROBLEM
9. Evaporator frosting
up.
NOTE: 90% frosting of
evaporator is normal un-
der low ambient, high
humidity conditions, and
70% ice blockage is to be
considered normal.
NOTE: Initial startup on
rotary compressor-
equipped units may
cause frosting on the first
2 or 3 evaporator passes
(for approximately 20
minutes) until refrigerant
is driven out of the oil by
heating.
10.Remote control does
not operate unit.
11. Moisture dripping into
room.
12. Excess condensation
running outside.
PROBABLE CAUSE
9a.Low outside air temperature (below
65°F).
9b. Thermistor failed.
9c. Improper airflow.
9d. Fan motor slow.
10a. Batteries dead.
10b. Remote failed.
11a. Extreme humidity.
11b. Inadequate seal.
11c. Improper level.
11d. Styrofoam shield under evaporator coil
broken or missing (see photo, on page
3-14).
12a. Extreme humidity.
5-4
CORRECTION
9a.Instruct customer that opera-
tion at ambient temperatures
below 65°F is not considered a
normal requirement of the unit.
Adjust the controls to a warmer
setting.
9b.Check thermistor by placing it
in ice water and check resis-
tance (see chart on page 4-1).
9c. Clean or replace air filter.
Check for obstructed or re-
stricted air passage, dirty
evaporator and blower wheel
loose, or missing seals.
9d.Check for binding of fan blade,
blower wheel, or motor bear-
ings. Use low fan speed and
instruct the customer.
10a. Check that unit operates
manually at control panel. If it
does, replace batteries in
remote.
10b. Replace remote control.
11a. Advise customer of possible
sweating formations under
abnormal conditions. Check
and improve all possible
seals.
11b. Check and improve all sealed
areas.
11c. Check for proper side-to-side
level of unit. Check for 1/2"
rear slope (or 1 full bubble)
on spirit level.
11d. Replace styrofoam shield.
12a. This condition is normal in
areas of extreme humidity.